GLASS is a cycle-21 large program (Program 13459) with the Hubble Space Telescope, targeting 10 massive clusters, including the 6 Frontier Fields, using the WFC3 and ACS grisms. The program consists of 140 primary orbits (with the G102 and G141 grisms) and 140 parallel orbits (with the G800L grism). Using the clusters as cosmic telescopes, GLASS is taking spectra of faint background galaxies with unprecedented sensitivity and angular resolution. GLASS has three primary science drivers, although a variety of other science investigations are possible in combination with imaging campaigns like the Frontier Fields Initiative and CLASH.

The key science drivers of GLASS are:

To shed light upon the role of galaxies in reionizing the universe, the topology of high redshift intergalactic/interstellar medium and on Lyman alpha escape fraction.

GLASS WFC3 NIR Release

Click on "LOAD" to visit a page containing the extracted target table for the redshift catalog (#7 in the list of data products) of that cluster. Each extracted target has a "quick-look" summary plot, as well as links to download that target's data products, or visit that target's "Details" page that provides plot and links to all the data products for that target.

Two "tar.gz" files are also provided below the "LOAD" link: "m≤24" contains all data products for bright sources with MAGAUTO ≤ 24, while "M>24" contains all data products for faint sources with MAGAUTO > 24.

If you prefer to browse and download files directly through your web broswer, click on the "BROWSE" link to access a cluster's data products. Note that only objects from the redshift catalog (#7 in the list of data products) have their own sub directories here. To obtain data for any object in the Source Catalog (#6 in the list of data products) please download the tarballs for the bright and/or faint objects (#9 and #10 in the list of data products).

*The GLASS redshift catalog only includes sources within 0.1" of a source from the master (HST+VLT+KECK for MACS1149, CLASH-Hubble Frontier Fields for MACS0416) redshift catalog. These are the sources that appear in the page displayed via the "Load" link.

GLASS ACS Optical Parallel Release: Position Angle 1

Click on "LOAD" to visit a page containing the extracted target table for the redshift catalog (#7 in the list of data products) of that cluster. Each extracted target has a "quick-look" summary plot, as well as links to download that target's data products, or visit that target's "Details" page that provides plot and links to all the data products for that target.

One "tar.gz" files is also provided below the "LOAD" link, which contains all data products

If you prefer to browse and download files directly through your web broswer, click on the "BROWSE" link to access a cluster's data products. Note that only objects from the redshift catalog (#7 in the list of data products) have their own sub directories here. To obtain data for any object in the Source Catalog (#6 in the list of data products) please download the tarballs for the objects (#9 in the data products).